gob_util: Update conn.params -> conn.req_params.
gob_util: Update conn.params -> conn.req_params.

Followup to CL:167920

BUG=chromium:284692
TEST=Unit tests

Change-Id: Ie0c6daf8132b298b59ae081f94dcf980f7161e73
Reviewed-on: https://chromium-review.googlesource.com/168887
Reviewed-by: David James <f231dc574bbeb62604660cbc162d1b8642a0a3af@chromium.org>
Tested-by: David James <f231dc574bbeb62604660cbc162d1b8642a0a3af@chromium.org>

bpsinc-native/src_third_party_chromite,bpsinc-native/src_third_party_chromite,bpsinc-native/src_third_party_chromite,chadversary/chromiumos.chromite,chadversary/chromiumos.chromite